Study And Design Of USB To RS485 Interface Conversion For Industrial Environment

With the development of computer, the peripheral interface is changing from the slow speed serial port to the high speed and performance USB port, and getting more and more popular. However in industrial environment, the most popular communication interface is RS485 port. So if there is a technology that can converter data between these two interfaces efficiently, and be used in industrial environment reliably to withstand any disturbance, then the application foreground is very large.First step is to do some study on these two interfaces, that is to say to know what the advantage and the electric characteristic, then to know how to use them fully which is the basis of this conversion technology. Second step is to analyze the current technology status. Now there are several companies that have products based on this technology. It is better to do some impersonal studies on them to know the disadvantages, then to understand where is the excellent the conversion technology has described in this article.Now that the importance of this conversion technology is interface conversion, this article has two sides to describe. One side is to explain the circuit design, analyze IC characteristic, and describe one by one part. Another side is to illustrate how to do EMC design to withstand disturbance from selection of component, protection circuit design and mechanical design, then this conversion technology can be used in industrial environment safely.Besides the theoretical analysis, it still needs the critical test to verify it. By using compliant international industrial equipment standard to test, this can prove that this conversion technology not only has academic basic but also the test validation.Finally this article shows the future trend of this technology and some extended technology to be more flexible for the marketing requirements.